Appeal No. 2000-1459
Application No. 08/703,907
communication systems. More particularly, the conventional
manner of determining a new satellite communication beam to be
selected based on a computed position and a moving direction
of a mobile unit requires determination of adjacent beams, the
selection of a switching candidate and the determination of
availability of the candidate, calculations which require a
long period of time, resulting in disconnected calls during
this time. The instant invention is said to solve this
problem by providing a position-beam correspondence data table
which stores data correlating each of a plurality of regions
on the ground to a particular beam of the multi-beam
communication satellite covering the general area. Once the
position of the mobile terminal is computed, this position is
used to index the position-beam correspondence data table and
looks up the corresponding beam in the table. In this manner,
the appropriate beam selection is determined at any time
merely by determining the ground position of the mobile
satellite communication terminal and accessing the position-
beam correspondence data table. Unlike the conventional
systems, it is not necessary to wait until communication line
quality starts to deteriorate before initiating a beam
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